海洋预报2023，Vol.40Issue(6)：67-77,11.DOI:10.11737/j.issn.1003-0239.2023.06.007
基于ASCAT风场数据的热带气旋风圈半径的研究
Study on wind radius of tropical cyclone based on ASCAT wind field data
摘要
Abstract
This paper introduces a method for calculating the wind radius(34-knot and 50-knot wind radii,R34 and R50)when the wind speed of a tropical cyclone reaches 34 knots and 50 knots based on the ASCAT scatterometer wind field data.Tropical cyclones(TC)occurred in the Northwest Pacific and North Atlantic from 2013 to 2022 are analyzed using Best Track dataset provided by NOAA,the results show that:The R34 estimated by ASCAT is about 4.5%larger than the Best Track record,and the standard error,root mean square error and correlation coefficient are 8.6 km,52.4 km and 0.88,respectively;The R50 is about 4.0%smaller than the Best Track record,and the corresponding values are-15.4 km,39.6 km and 0.74,respectively;The correlation coeffi-cient between TC intensity(maximum sustained wind speed)and R34 in two basins is 0.62～0.66,while that of R50 is 0.36～0.48,suggesting that R34 has a better performance in characterizing TC's influence intensity and scale.It also indicates that the wind radius obtained from ASCAT wind field is valuable in monitoring and predicting TC's intensity.Using R34 to define the size of TC and categorical statistics,we find that the peak value of mean TC size occurs in September and October in both basins,and the total number of medium TC is the largest.The trend of the three types(small,medium,large)of TC shows unimodal distribution,the peak values of small and medium TC occur in September,and that of large TC lag by one month.关键词
ASCAT散射计/热带气旋/最佳路径数据/34节风圈半径Key words
ASCAT scatterometer/tropical cyclone/best track dataset/34-knot wind radii分类
海洋科学引用本文复制引用
董海啸,冯佳俊,张渊智..基于ASCAT风场数据的热带气旋风圈半径的研究[J].海洋预报,2023,40(6):67-77,11.基金项目
国家自然科学基金-广东联合基金重点项目(U1901215). （U1901215）
